Extension-gear



(No Model.)

W. E. GOLDING.

EXTENSION GEAR.

No. 593,932. Patented N0vf16 189'7.

INVENTOI? p Y UNITED STATES PATENT FFICE.

WILLIAM E. GOLDING, OF WAKEFIELD, NEW YORK.

EXTENSION-G EAR.

SPECIFICATION forming part of Letters Patent No. 593,932, dated November 16, 1897. Application filed July 28,1897. Serial No. 646,189. (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM E. GOLDING, of Wakefield, county and State of New York, have invented a new and Improved Extension- Gear, of which the following is a full, clear, and exact description. 7

The object of the invention is to provide a new and improved extension-gear more especially designed for bicycle sprocket-Wheels and arranged to permita'convenient and secure attachment of an extension sprocketwheel on the one used on the machine.

The invention consists principally of a p sprocket-wheel rim formed with sprockets and having flanges on both sides engaging opposite faces of the sprocket-wheel on the machine.

The invention also consists of certain. parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out-in the claims.

Reference is to be had to the accompanying drawings,forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a front face View of the improvement. Fig. 2 is a rear face view of the same. Fig. 3 is a transverse section of the same on the line 3 3 of Fig. 2. Fig. 4 is a perspective view of part of the improvement as applied and previous to forming the flange from one of the bosses on the rear face of the sprocket-wheel, and Fig. 5 is a transverse section of the same on the line 5 5 in Fig. 4.

The sprocket-wheel A on the machine and to be increased in size by the extension-gear is formed with the usual rim A and the teeth A as is plainly illustrated in Figs. 1 and 2. The extension-gear is in the form of a circular rim B, formed on its inside with recesses B to fit laterally over the teeth A of the sprocketwheel A, the said rim being also provided with the usual teeth or sprockets B for engagement by the sprocket-chain.

On one face of the rim B are formed a plurality of flanges 13 each adapted to engage part of the rim A and the sides of the adjacent teeth A as is plainly shown in Figs. 1, 3, and 5, to prevent lateral movement of the rim B on the sprocket-wheel A in one direction. On the opposite face of the rim B, and preferably directly opposite the flanges B are formed bosses B adapted to pass between two adjacent teeth A of the wheel A when the rim is laterally applied on the sprocket Wheel, and the flanges B abut against one face of the said wheel. (See Fig. 5.)

When the rim B has been placed in position on the wheel A, as described, then the bosses with the sprockets or teeth A of the wheel A.

It is expressly understood that the device as manufactured and sold is formed on one face with the flanges B and on the opposite sides with only the bosses 13 so as to permit of conveniently placing the rim in position on the peripheral surface of the sprocketwheel-A, and when this has been done then the bosses B are formed into flanges by pressin g the same to lock the rim securely in place on the sprocket-wheel, so as to form an extension-gear for the same.

Havingthus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. An extension-rim having a plurality of flanges on one face, and a plurality of bosses on the opposite face, the bosses being adapted to 'be formed into flanges, substantially as shown and described.

2. An extension-rim having a plurality of flanges on one face, and a plurality of bosses on the opposite face, the bosses being adapted to be formed into flanges, the said flanges and bosses being arranged one opposite the other,

as set forth.

WILLIAM E. GOLDING. Witnesses:

GEORGE II. SUNDERMANN, WILLIAM DEE MILLER. 

